Matching Simple Strings

The simplest and most common type of regex is an alphanumeric string that matches itself, called a "literal text match". A literal text regex matches anywhere along a string. For example, a literal string matches itself when placed alone, and at the beginning, middle, or end of a larger string. Literal text matches are case sensitive.

Using regexes to search for simple strings.

Example 1: Search for the string "at".

  • Regex:
    at
  • Matches:
    at
    math
    hat
    ate
  • Doesn't Match:
    it
    a-t
    At

Example 2: Search for the string "email".

  • Regex:
    email
  • Matches:
    email
    emailing
    many_emails
  • Doesn't Match:
    Email
    EMAILing
    e-mails

Example 3: Search for the string "abcdE567".

  • Regex:
    abcdE567
  • Matches:
    abcdE567
    AabcdE567ing
    text_abcdE567
  • Doesn't Match:
    SPAMabCdE567
    ABCDe567
Note: Regular expressions are case sensitive unless case is deliberately modified.